排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
Restu Kartiko Widi Sharifah Bee Abd Hamid Robert Schlogl 《Reaction Kinetics and Catalysis Letters》2009,98(2):273-286
Reaction kinetics and proposed mechanism for the oxidation of propane over diluted Mo1–V0.3–Te0.23–Nb0.125–O
x
are described. The kinetic study allowed determination of the orders of propane disappearance, propene formation, CO
x
formation, and acids formation. The results show that selective oxidation of propane to propylene over this catalyst follows
the Langmuir-Hinshelwood mechanism. Deep oxidation of propane to carbon dioxide is first order with respect to hydrocarbon,
and partial order (0.21) with respect to oxygen. The selective oxidation of propane to acrylic acid is half order with respect
to hydrocarbon and partial order (0.11) with respect to oxygen, while water does not participate directly in propane transformation.
The result also shows that the overall reaction consists of three parallel process channels. One main sequence of consecutive
reactions leads to the desired product. 相似文献
2.
I Made Agus Gelgel Wirasuta Ni Made Amelia Ratnata Dewi Kadek Duwi Cahyadi Luh Putu Mirah Kusuma Dewi Ni Made Widi Astuti I Nyoman Kadjeng Widjaja 《Chromatographia》2013,76(19-20):1261-1269
The decision limit (CCα), capability of detection (CCβ) and quantification limit (QL) are importance performance characteristics in method validation. The TLC-Scanner 3 from Camag provides the possibility to choose the slit dimension of light to determine the peak chromatogram of a substance. The influence of the slit dimension for determination of CCα, CCβ and QL of paracetamol has been carried out. Paracetamol was spotted onto plates of AL-TLC Si G 60 F254 by linomat 4 in the range of 50–400 ng/spot and 10–400 ng/band, then on twin chambers eluted with TAEA (toluene:acetone-ethanol:conc.ammonia, 45 + 45 + 7 + 3 v/v) for 45 mm. Eluted spots were scanned in different slit dimensions at 248 nm. The CCα, CCβ and QL of paracetamol were estimated through the linear regression (LRM) and signal-to-noise (S/N) methods. Slit lengths between 50 and 133 % of the band width of the spots, and with the noise factor of the slit under 2.6, produced good precision measurements of TLC-densitometry between plates, while slit lengths between 50 and 83 % of the band width of the spots introduced a higher sensitivity response of the detector. The estimated CCα, CCβ and QL were determined by how the data were collected, the analytical optical setting, and the usage method for the estimation of both validation parameters. 相似文献
3.
Effect of diluent and reaction parameter on selective oxidation of propane over MoVTeNb catalyst using nanoflow catalytic reactor
下载免费PDF全文
![点击此处可从《天然气化学杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The selective oxidation of propane to acrylic acid over an MoVTeNb mixed oxide catalyst, dried and calcined before reaction has been studied using high-throughput instrumentation, which is called nanoflow catalytic reactor. The effects of catalyst dilution on the catalytic performance of the MoVTeNb mixed oxide catalyst in selective oxidation of propane to acrylic acid were also investigated. The effects of some reaction parameters, such as gas hourly space velocity (GHSV) and reaction temperature, for selective oxidation of propane to acrylic acid over diluted MoVTeNb catalyst have also been studied. The configuration of the nanoflow is shown to be suitable for screen catalytic performance, and its operating conditions were mimicked closely to conventional laboratory as well as to industrial conditions. The results obtained provided very good reproducibility and it showed that preparation methods as well as reaction parameters can play significant roles in catalytic performance of these catalysts. 相似文献
4.
Laksmana Widi Prasetya Aditya Rio Prabowo Ubaidillah Ubaidillah Iwan Istanto Nur Azmah Binti Nordin 《力学快报》2021,11(2):100235
The impact attenuator is an essential system in both race cars and urban vehicles. The structure of an impact attenuator serves as a safety barrier between the impacted surface and the driver in an accident.Attenuator materials tend to have a high price; thus, alternative materials were explored in the current work, i.e., used cans from food and beverage containers. The study deployed a nonlinear finite element algorithm to calculate a series of impacts on the attenuator structures. The thickness of the cans and velocity of the impact were considered as the main parameters. Analysis results concluded that the attenuator's average energy was 160 0 0 J for a can thickness of 1 mm. This value is more than two times the0.5 mm thick used cans. The attenuator's new design was then matched with an attenuator regulation,and the results surpassed the standard value of 7350 J. 相似文献
1