中文摘要：

氯甲烷是一种在世界范围内广泛应用的化学产品. 本研究以蔗糖为模板剂、 异丙醇铝为铝源制备固体酸γ-l2O3催化剂, 研究了该催化剂催化甲醇氢氯化合成一氯甲烷的性能. 在催化剂制备过程中改变 pH 和物料比, 活性测试结果表明：在相同的实验条件下, pH 为 5.5 和蔗糖与异丙醇铝的摩尔比值为 1颐1 时, 制备的介孔γ-Al2O3 催化剂的甲醇转化率较商品γ-l2O3 催化剂的甲醇转化率有大幅提高. 通过 BET 及吡啶红外的测试结果表明： 以蔗糖为模板剂制备的催化剂具有较大的比表面, 孔径分布集中, 表面 Lewis 酸活性位点浓度较高.研究分析结果表明： 固体酸γ-l2O3 催化剂的活性与催化剂表面的 Lewis 中强酸浓度有关, 较高的中强酸浓度有助于提高催化剂活性.

英文摘要：

Methyl chloride is widely used in chemical product in the world. In this work, mesoporous γ-alumina wassynthesized used sucrose as templates and aluminum isopropoxide as aluminum source. Methyl chloride was synthesized onmesoporous γ-alumina by methanol and hydrogen chloride. The performance of catalysts were significantly affected by pH ofsolution and the ratio of raw material in the catalyst preparation process. The experimental results indicated that the conversionof methanol over mesoporous γ-alumina catalyst prepared with pH value of 5.5 and the molar ratio of sucrose and aluminumsource1∶1 is higher than that of commercial γ-alumina catalyst under the same experimental conditions. The catalysts werecharacterized by BET and FTIR pyridine adsorption measurements which show that the catalysts prepared using sucrose asatemplate hada rather high specific surface area, narrow pore-size distributions and large amount of Lewis acid sites. This studyhas shown that the activity of catalyst is related to the concentration of medium Lewis acid in surface of the catalyst, besides,higher concentration of medium Lewis acid can increase to the activity of the catalyst.