由于写论文急用，麻烦大家帮我翻译以下两段英语文章，谢谢大家啦（帮忙调整好语序，谢谢各位仁兄了）：1、Five samples with different Si/Ni molar ratios (8–100) were prepared by the conventional hydrothermal synthesis in an alkalifree medium. Nickel nitrate (Ni(NO3)2-6H2O), tetraethyl orthosilicate(TEOS,Si(OC2H5)4), cetyltrimethylammonium bromide (CTAB, C16H33(CH3)3NBr), and ammonia were used as precursors.The molar composition of the synthesis gel was 1TEOS:xNi:0.12CTAB:12.3NH4OH:84.4H2O. The resultant gels were crystallized in Teflon-lined autoclaves at 120 8C for 4 days under autogenous pressure. The solid products were recovered by filtration, washed with deionized water and dried at ambient temperature overnight. The template was removed by calcination at 540 8C for 6 h under flowing air. For comparison, siliceous MCM-41 and fumed-silica supported nickel catalysts with the same loading of nickel were prepared by wet impregnation with nickel nitrate solution.
2、The reducibility of catalysts was studied by hydrogen temperature-programmed reduction (TPR) on a Quantachrome Autosorb-1C apparatus. Prior to reduction, the sample (0.25 g) was pretreated with air at 500 8C for 60 min and then cooled to 90 8C.The TPR experiment was performed under 5 vol.% H2/Ar mixture at a heating rate of 8 8C/min from 90 to 950 8C. The consumption of hydrogen was monitored on-line with a build-in thermal conductivity detector (TCD).