Cr2O3在铜基甲醇合成催化剂中的作用

研究了三组份Cu－ZnO－Al_2O_3催化剂添加Cr_2O_3后．铬在催化剂中的存在形式，助催作用本质及其与甲醇含成催化活性的关联。结果表明：在ZnO－Cr_2O_3催化剂中，铬以Cr~(3 )和ZnCr_2O_4形式存在于ZnO晶格中，Cu-ZnO-Al_2O_3-Cr_2O_3催化剂的催化活性与CR~(3 )在ZnO晶格中诱导出来的正一价缺位和催化剂的其它顺磁性物种的ESR强度能很好地关联，在活性测试中，以含1％Cr（原子比）的Cu-ZnO-Al_2O_3-Cr_2O_3的催化活性最高。

The Effects of Cr_2O_3 over Copper-based Catalysts for Methanol Synthesis

The method of doping the trivalent, canon into copper-based catalyst for methanol synthesis is effective in enhancing catalytic activity. The form of chromium in the catalyst and the nature of promotion effect as well as its relation to catalytic activity after doping Cr2O3 into Cu-ZnO-Al2O3 has been studied by XRD, ESR,TPR and the determination of catalytic activity.The results showed that chromium exists in the ZnO lattice as both Cr3 and ZnCr2O4. Catalyticactivity of Cu-ZnO-Al2O3-Cr2O3 catalyst for methanol synthesis and ESR intensity of the monovalent defect induced by dissolving Cr3 into ZnO lattice as well as other ESR, species in catalyst are well interrelated. The catalyst containing one per cent of Cr3 (atomic ratio) has the highest catalytic activity.