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SYNGAS PRODUCTION BY CO2 REFORMING OF CH4 OVER Ni-CONTAINING XEROGEL Al2O3-ZrO2(Yb2O3) WITH POLYVINYLPYRROLIDONстатья Тезисы
- Авторы: Vakhrushev N.E., Murga Z.V., Mikhalenko I.I.
- Сборник: Физическая химия и электрохимия расплавленных и твердых электролитов
- Год издания: 2020
- Место издания: Дом «Ажур» Екатеринбург
- Первая страница: 178
- Последняя страница: 181
- Аннотация: The dry reforming of methane (DRM) reaction CO2 + CH4 ↔ 2CO +2H2 shows great potential in conversion two greenhouse gases into highpurity syngas as feedstock for synthesis of higher hydrocarbons and oxygenates (Fischer-Tropsch process). Ni-based supported alumina or silica systemsare good cost-effective catalysts but their practical applications restrict hightemperatures of reaction that leads to catalyst deactivation by carbon deposits,sintering, phase transformation.In our study supported 5% wt. Ni catalysts with hybrid mixed oxidessupport Ni/AZ(Yb)PVP (sol-gel technique with polymer addition) were prepared and tested in DRM reaction in compare with Ni/Al2O3. Catalysts wereexamined using BET XRD, XPS, ESR, SEM, TEM methods. and «worked»DRM tests were performed at atmospheric pressure in U-shape quartz reactor(flow rate of 20 ml/min, molar ratio CO2-CН4, gas chromatograph Crystal2000 on line, Ar gas carrier). For only calcinated Ni/AZ(Yb)PVP samplescatalytic tests were with heating-cooling 723 1023 723 K cycles. The different type of temperature hysteresis ("clockwise" for CH4 and «anticlockwise» for CO2) with different apparent activation energy of product`sformation was found. In reducing Ni+2 in situ by DRM reaction products wecan obtain active and stable to carbon formation surface for Ni catalyst withcomposite support. For stationary activity molar ratio H2/CO1 in heatingmode, but H2/CO<1 when 5%Ni/AZ(Yb)PVP catalyst is cooling. IncreasingNi loading doesn't augment sufficiently the values of CO2 and CH4 conversion or CO, H2 yields.
- Добавил в систему: Вахрушев Николай Евгеньевич