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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Development of ZnO/Al_2O_3 catalyst for reverse-water-gas-shift reaction of CAMERE(carbon dioxide hydrogenation to form methanol via a reverse-water-gas-shift reaction)process
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Development of ZnO/Al_2O_3 catalyst for reverse-water-gas-shift reaction of CAMERE(carbon dioxide hydrogenation to form methanol via a reverse-water-gas-shift reaction)process

机译：用于CAMERE（二氧化碳加氢通过逆水煤气变换反应生成甲醇）工艺的水煤气变换反应的ZnO / Al_2O_3催化剂的开发

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ZnO and ZnO/Al_2O_3 catalysts were studied for a reverse-water-gas-shift reaction (RWReaction). The catalytic activities depended on the compositions of Zn and AI at the temperature range of 673-973 K and GHSV of 15,000. The activities were close to the equilibrium conversion at temperatures above 873 K. The catalysts were characterized by using BET, TPR, XRD, SEM, and TEM. The ZnO/A1203 catalysts were mixtures of ZnO and ZnAl_20_4 phases, and the particle size of the ZnO was strongly dependent on its composition in the ZnO/A1_20_3 catalysts. ZnO/A1_20_3 (Zn:AI = 1:1) catalyst has the smallest particle size of ZnO and its conversion of CO2 at 873 K and GHSV of 150,000 was 43%. The stability of ZnO/ AI203 catalysts increased in the presence of the large particles of ZnO. Hence, ZnO/ Al_20_3 (Zn:AI = 4: I) catalyst was more stable than the ZnO/A1_20_3 (Zn:AI = 1:1) catalyst. The conversion of CO_2 on the ZnO/A1_20_3 (Zn:AI = 1:1) catalyst decreased from 43 to 17% in 48h. The ZnO in ZnO/A1_20_3 catalysts was reduced to the Zn metal during the RWReaction, which contributed to Ithe deactivation of the ZnO/ Al_20_3 catalysts. Meanwhile, the activity of ZnAl_20_4 catalyst was stable for 100 hat 873 K and GHSV of 150,000. The ZnAl_20_4 catalyst was developed for the RWReaction of the CAMERE (carbon dioxide hydrogenation to form methanol via a reverse-water-gas-shift reaction) process for methanol formation from CO_2.
机译：研究了ZnO和ZnO / Al_2O_3催化剂用于反向水煤气变换反应（RWReaction）。催化活性取决于在673-973 K和GHSV为15,000的温度范围内Zn和AI的组成。在高于873 K的温度下，活性接近于平衡转化率。使用BET，TPR，XRD，SEM和TEM对催化剂进行了表征。 ZnO / A1203催化剂是ZnO和ZnAl_20_4相的混合物，并且ZnO的粒径强烈取决于其在ZnO / A1_20_3催化剂中的组成。 ZnO / A1_20_3（Zn：Al = 1：1）催化剂的ZnO粒径最小，其在873 K和150,000 GHSV下的CO2转化率为43％。 ZnO / Al2O3催化剂的稳定性在大颗粒ZnO的存在下增加。因此，ZnO / Al_20_3（Zn：Al = 4：I）催化剂比ZnO / Al_20_3（Zn：Al = 1：1）催化剂更稳定。 ZnO / Al_20_3（Zn：Al = 1：1）催化剂上的CO_2转化率在48小时内从43％降至17％。在RW反应期间，ZnO / Al_20_3催化剂中的ZnO被还原为Zn金属，这导致ZnO / Al_20_3催化剂的失活。同时，ZnAl_20_4催化剂的活性对于100 hat 873 K和150,000的GHSV是稳定的。开发了ZnAl_20_4催化剂用于CAMERE的RW反应（二氧化碳通过逆水煤气变换反应加氢生成甲醇）过程，以从CO_2形成甲醇。

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