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ankang276金虫 (正式写手)
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Catalyst aciditieswere determined by n-propylamine (nPA) pulsed adsorption and TPD using a Micromeritics Autochem II 2920 unit equipped with a thermal conductivity detector (TCD). Approximately 40 mg of catalystwas pretreated in He (30 ml (STP)/min) at 120 °C for 1 h to remove water, followed by a 1 h treatment in H2 (30 ml (STP)/ min) at 400 °C to activate the passivated Mo2C, and finally a 2 h flush in He (30 ml (STP)/min) at 500 °C to remove adsorbed H2. While under He flow, the catalyst was cooled to 120 °C and a flow of He (30 ml (STP)/min) saturated at room temperature with n-PA (99+%, Aldrich) was injected into the He flow in 0.5 ml pulses. |
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爱与雨下(金币+1): 感谢应助，欢迎常来！ 2011-08-09 08:33:47
爱与雨下(金币+1): 感谢应助，欢迎常来！ 2011-08-09 08:33:47
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Catalyst acidities were determined by n-propylamine (nPA) pulsedadsorption and TPD using a Micromeritics Autochem II 2920 unitequipped with a thermal conductivity detector (TCD). Approximately40 mg of catalystwas pretreated in He (30 ml (STP)/min) at 120 °C for1 h to remove water, followed by a 1 h treatment in H2 (30 ml (STP)/min) at 400 °C to activate the passivated Mo2C, and finally a 2 h flushin He (30 ml (STP)/min) at 500 °C to remove adsorbed H2. Whileunder He flow, the catalyst was cooled to 120 °C and a flow of He(30 ml (STP)/min) saturated at room temperature with n-PA (99+%,Aldrich) was injected into the He flow in 0.5 ml pulses. 催化剂的酸性通过正丙胺脉冲吸收，同时使用配备了热传导检测器的Micromeritics Autochem II 2920 型装置进行了TPD的测定。将40mg左右的催化剂使用氦气（流速为30毫升【标况时的体积】/分钟 ）120℃下进行除水预处理1h。然后使用氢气（流速为30ml[标况下的体积]/min）在400℃活化被钝化的Mo2C，这个过程持续1h。最后使用氦气（流速为30毫升【标况时的体积】/分钟）进行冲洗1h。 当催化剂冷却到120℃时，使用室温下含正丙胺饱和处理的氦气以每分钟30mL【体积为标况下测定】，每次0.5ml的速度加入。 |
2楼2011-08-09 08:24:47
liubencai
木虫之王 (文坛精英)
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sltmac(金币+1): 感谢应助~ 2011-08-09 09:15:59
ankang276(金币+36, 翻译EPI+1): 2011-08-09 13:36:40
sltmac(金币+1): 感谢应助~ 2011-08-09 09:15:59
ankang276(金币+36, 翻译EPI+1): 2011-08-09 13:36:40
| 催化剂的酸度测定是通过正-丙胺（nPA）的脉冲吸附，使用配有热导检测器（TCD）的Micromeritics Autochem II 2920装置进行程序升温脱附(TPD)。将大约40mg的催化剂在氦气流（30毫升(标准温度和压力)/分钟）120℃下进行除水预处理1小时，然后使用氢气（30毫升(标准温度和压力)/分钟）在400℃活化这个钝化的Mo2C，这个处理过程持续1h；最后用氦气（流速为30毫升(标准温度和压力)/分钟）进行冲洗2h，来脱附已吸附的氢气。当氦气流下的催化剂冷却到120℃时，将室温含有正丙胺(99+%, Aldrich)饱和的氦气流(30毫升(标准温度和压力)/分钟)，以每次0.5ml的脉冲速度注入氦气流。 |
3楼2011-08-09 09:03:26
