[미국특허]
Supported precious metal catalysts via hydrothermal deposition
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-023/00
B01J-021/00
B01J-020/00
출원번호
US-0759320
(2010-04-13)
등록번호
US-8450236
(2013-05-28)
발명자
/ 주소
Fu, Guoyi
Watson, Mark B.
Muehlberger, Charles B.
출원인 / 주소
Cristal USA Inc.
대리인 / 주소
Dunlap Codding, P.C.
인용정보
피인용 횟수 :
4인용 특허 :
46
초록▼
A process for making a catalyst having precious metal nanoparticles deposited on a support includes first providing an aqueous dispersion of support particles. A pre-treatment slurry is prepared by mixing the aqueous dispersion of support particles with a water-soluble precious metal precursor and a
A process for making a catalyst having precious metal nanoparticles deposited on a support includes first providing an aqueous dispersion of support particles. A pre-treatment slurry is prepared by mixing the aqueous dispersion of support particles with a water-soluble precious metal precursor and a reducing agent. The pre-treatment slurry is hydrothermally treated at a temperature in the range of from about 40° C. to about 220° C. for a time sufficient to deposit precious metal nanoparticles on the surface of the support particles, the precious metal nanoparticles having an average particle size less about 50 nm.
대표청구항▼
1. A process for making a catalyst having precious metal nanoparticles deposited on a support, the process comprising the following steps: (a) preparing a slurry of an aqueous dispersion of support particles, a water-soluble precious metal precursor, and a reducing agent; and(b) hydrothermally treat
1. A process for making a catalyst having precious metal nanoparticles deposited on a support, the process comprising the following steps: (a) preparing a slurry of an aqueous dispersion of support particles, a water-soluble precious metal precursor, and a reducing agent; and(b) hydrothermally treating the slurry in a sealed system by heating the slurry to a temperature in a range of from about 40° C. to about 220° C. at autogenic pressure for a time sufficient to deposit precious metal nanoparticles, in a metallic form, onto at least a portion of a surface of the support particles, the precious metal nanoparticles having an average particle size less than about 50 nm. 2. The process of claim 1, wherein the support particles comprise a particulate metal oxide. 3. The process of claim 2, wherein the particulate metal oxide is particulate titanium dioxide. 4. The process of claim 3, wherein the titanium dioxide is primarily in the anatase form. 5. The process of claim 1, wherein the precious metal precursor is selected from the group consisting of metal precursors of gold, palladium, platinum and silver. 6. The process of claim 1, wherein the precious metal precursor comprises a metallic gold precursor, and wherein the particle size of the resulting metallic gold nanoparticles is controlled, in part, by heating the slurry to a temperature in the range of from about 50° C. to about 130° C. in the step for hydrothermally treating. 7. The process of claim 6, wherein the precious metal precursor is selected from the group consisting of sodium tetrachloroaurate, potassium tetrabromoaurate, hydrogen tetranitroaurate and combinations thereof. 8. The process of claim 6, wherein the reducing agent is selected from the group consisting of ethanol, iso-propanol, butanediol and combinations thereof. 9. The process of claim 1, wherein the precious metal precursor comprises a metallic platinum precursor, and wherein the particle size of the resulting metallic platinum nanoparticles is controlled, in part, by heating the slurry to a temperature in the range of from about 50° C. to about 150° C. in the step for hydrothermally treating. 10. The process of claim 9, wherein the precious metal precursor is selected from the group consisting of hexachloroplatinic acid, sodium tetrachloroplatinate, platinum sulfate and combinations thereof. 11. The process of claim 9, wherein the reducing agent is selected from the group consisting of ethanol, iso-propanol, butanediol and combinations thereof. 12. The process of claim 1, wherein the precious metal precursor comprises a metallic palladium precursor, and wherein the particle size of the resulting metallic palladium nanoparticles is controlled, in part, by heating the slurry to a temperature in the range of from about 50° C. to about 180° C. in the step for hydrothermally treating. 13. The process of claim 12, wherein the precious metal precursor is selected from the group consisting of palladium chloride, sodium tetrachloropalladate, palladium sulfate and combinations thereof. 14. The process of claim 12, wherein the reducing agent is selected from the group consisting of sodium tetrahydridoborate, sodium hypophosphite and combinations thereof. 15. The process of claim 1, wherein the precious metal precursor comprises a metallic silver precursor, and wherein the particle size of the resulting metallic silver nanoparticles is controlled, in part, by heating the slurry to a temperature in the range of from about 50° C. to about 200° C. in the step for hydrothermally treating. 16. The process of claim 15, wherein the precious metal precursor is selected from the group consisting of silver nitrate, silver perchlorate, silver sulfate and combinations thereof. 17. The process of claim 15, wherein the reducing agent is selected from the group consisting of ethanol, iso-propanol and combinations thereof. 18. The process of claim 1, wherein the slurry further comprises a particle size controlling agent selected from the group consisting of stearic acid, oleic acid, linoleic acid and combinations thereof. 19. The process of claim 1, wherein the slurry further comprises a dispersant. 20. The process of claim 1, further comprising the steps of: (c) filtering the hydrothermally treated slurry; and(d) calcining the filtered support particles having the metallic precious metal nanoparticles deposited thereon. 21. A method for controlling the particle size and effective surface area of supported catalytic precious metal nanoparticles, the method comprising: (a) preparing a slurry of an aqueous dispersion of support particles, a water-soluble precious metal precursor, and a reducing agent; and(b) hydrothermally treating the slurry in a sealed system by heating the slurry to a predetermined temperature in a range of from about 40° C. to about 220° C. at autogenic pressure for a time sufficient to deposit precious metal nanoparticles, in a metallic form and having a preselected particle size, onto at least a portion of a surface of the support particles, the temperature determined based on the precious metal and the selected particle size.
Zhou,Bing; Trevino,Horacio; Wu,Zhihua; Zhou,Zhenhua; Liu,Changkun, Heat treatment of anchored nanocatalysts in a non-zero oxidation state and catalysts made by such method.
Zhou,Bing; Rueter,Michael, Intermediate precursor compositions used to make supported catalysts having a controlled coordination structure and methods for preparing such compositions.
Haruta Masatake (Kawanishi JPX) Sano Hiroshi (Toyonaka JPX) Kobayashi Tetsuhiko (Ikeda JPX), Method for manufacture of catalyst composite having gold or mixture of gold with catalytic metal oxide deposited on carr.
Hagemeyer, Alfred; Dingerdissen, Uwe; Kuhlein, Klaus; Manz, Andreas; Fischer, Roland, Method for producing catalysts containing metal nanoparticles on a porous support, especially for gas phase oxidation of ethylene and acetic acid to form vinyl acetate.
Kezuka, Masamichi; Miyashita, Kiyoshi; Ogawa, Ryohei; Hishinuma, Akihiro, Photocatalyst containing metallic ultrafine particles and process for producing said photocatalyst.
Hagemeyer Alfred,DEX ; Dingerdissen Uwe,DEX ; Millauer Hans,DEX ; Manz Andreas,DEX ; Kuhlein Klaus,DEX, Polybetaine-stabilized, palladium-containing nanoparticles, a process for preparing them and also catalysts prepared from them for producing vinyl acetate.
Thollon, Stéphanie; Luc, Fabien; Barrault, Joël; Valange, Sabine; Guelou, Erwan; Daturi, Marco; Can, Fabien, Process for preparing metal or metal alloy nanoparticles dispersed on a substrate by chemical vapour deposition.
Bonnemann Helmut,DEX ; Brijoux Werner,DEX ; Brinkmann Rainer,DEX ; Richter Joachim,DEX, Process for producing tenside-stabilized colloids of mono- and bimetals of the group VIII and Ib of the periodic system in the form of precursors for catalysts which are isolable and water soluble at.
Uzio, Denis; Verdon, Catherine; Thomazeau, Cecile; Harbuzaru, Bogdan; Berhault, Gilles, Process for synthesizing anisotropic metallic nanoparticles using two different reducing agents.
Gardano Andrea (Vercelli ITX) Coassolo Alfredo (Novara ITX) Casagrande Francesco (San Nazzaro Sesia ITX) Fo Marco (Novara ITX) Chapoy Larry L. (Novara ITX), Process for the synthesis of aromatic phenyl substituted diols.
Fanson, Paul T.; Hirata, Hirohito; Amiridis, Michael D.; Williams, Christopher T.; Deutsch, David S.; Siani, Attilio; Matsumoto, Shinichi, Supported catalysts with controlled metal cluster size.
Adzic, Radoslav; Vukmirovic, Miomir; Sasaki, Kotaro, Synthesis of metal-metal oxide catalysts and electrocatalysts using a metal cation adsorption/reduction and adatom replacement by more noble ones.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.