甲醇脱氢制甲醛负载型铜基催化剂的制备及性能

STUDY ON THE SUPPORTED Cu-BASE CATALYST FOR THE DEHYDROGENATION OF METHANOL TO FORMALDEHYDE

用硝酸铜氨溶液浸渍硅胶制备了甲醇脱氢制甲醛催化剂ＣｕＯ／ＳｉＯ２，考察了铜源、ｐＨ值、铜负载量和助剂Ｃｒ对催化活性的影响．ＴＰＲ和ＸＲＤ研究表明，ＣｕＯ／ＳｉＯ２中起催化活性作用的主要是分散态ＣｕＯ，而聚集态ＣｕＯ增多会导致甲醛选择性下降，助剂Ｃｒ能明显提高ＣｕＯ／ＳｉＯ２的催化活性和抗还原能力．

CuO/SiO 2 catalyst for the dehydrogenation of methanol to formaldehyde wasprepared by impregnation of SiO 2 with ammonia solution of copper nitrate.The effects of precursors of copper, pH, copper content and additives were investigated based on the results of experiments. The catalyst was characterized by X-ray diffraction and TPR. The dispersed CuO gives main active contribution to methanoldehydrogenation, but the collected CuO can lead to the decrease of formaldehyde selectivity.The additive Cr can distinctly increase the activity and resistance to reducing of CuO/SiO 2.