Process assessment of small scale low temperature methanol synthesis

Hendriyana,; Susanto, Herri; Subagjo,

doi:10.1063/1.4938346

Cited by 5 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Langmuir−Hinshelwood models were used to interpret the reaction kinetics and the rate-determining steps were supposed to be the reaction between adsorbed hydrogen and adsorbed methyl formate on adjacent sites. These conclusions were supported by studies from the Hendriyana group, 394 who used Cu/MgO catalyst for methyl formate hydrogenation. In 2010, Mims group 395 observed the rate of reaction between bidentate formate and adsorbed hydrogen was different from that of methanol synthesis.…”

Section: Catalyst Developmentmentioning

confidence: 64%

Hydrogenation of Carboxylic Acids, Esters, and Related Compounds over Heterogeneous Catalysts: A Step toward Sustainable and Carbon-Neutral Processes

Junge

Beller

2023

Chem. Rev.

View full text Add to dashboard Cite

The catalytic hydrogenation of esters and carboxylic acids represents a fundamental and important class of organic transformations, which is widely applied in energy, environmental, agricultural, and pharmaceutical industries. Due to the low reactivity of the carbonyl group in carboxylic acids and esters, this type of reaction is, however, rather challenging. Hence, specifically active catalysts are required to achieve a satisfactory yield. Nevertheless, in recent years, remarkable progress has been made on the development of catalysts for this type of reaction, especially heterogeneous catalysts, which are generally dominating in industry. Here in this review, we discuss the recent breakthroughs as well as milestone achievements for the hydrogenation of industrially important carboxylic acids and esters utilizing heterogeneous catalysts. In addition, related catalytic hydrogenations that are considered of importance for the development of cleaner energy technologies and a circular chemical industry will be discussed in detail. Special attention is paid to the insights into the structure–activity relationship, which will help the readers to develop rational design strategies for the synthesis of more efficient heterogeneous catalysts.

show abstract

Section: Catalyst Developmentmentioning

confidence: 64%

Hydrogenation of Carboxylic Acids, Esters, and Related Compounds over Heterogeneous Catalysts: A Step toward Sustainable and Carbon-Neutral Processes

Junge

Beller

2023

Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…Several studies have shown the usefulness of thermodynamics for understanding the formation process of chemical species [30] such as ZnO [16,31] in certain specific conditions. Chemical stability diagrams derived from chemical data also have also informed stability predictions of reaction products in simple and complex systems, such as the formation of zinc corrosion products in an aqueous medium [32,33] . In this work, ZnO equilibrium, as well as mass and charge balances were used in order to obtain chemical stability and predominance diagrams.…”

Section: Resultsmentioning

confidence: 99%

Theoretical and Experimental Approach to the Production of ZnO Nanoparticles by Controlled Precipitation Method in Methanol

Suárez

León-Molina

2022

ChemistrySelect

View full text Add to dashboard Cite

Several works have demonstrated the utility of thermodynamics for understanding the formation process of ZnO in a specific ambient. In this work, equilibrium relations, mass balances and charge balances were used to derive chemical stability and predominance diagrams that allow relating the experimental observations of the synthesis of zinc oxide in methanol by the precipitation method to the expected product composition. The proposed equilibrium model considers the formation of zinc complexes with acetate (OAc−) and hydroxide (OH−) ions. Zinc oxide was also synthesized in similar conditions as those employed for calculations. The reaction monitoring was carried out by measuring pH and it was compared with the pH estimated using the model. Structural characterization of the product by X ray diffraction and scanning electron microscopy was performed. The proposed model predicts the formation of zinc oxide as the only species in the solid state, which agrees with the experimental results.

show abstract

“…Several studies have trained models for implicit aspect extraction using a dataset labeled with implicit aspects. Hendriyana et al proposed the sentence-level topic model (SLTM) [12]. It was a naive Bayes model that classified a review into pre-defined aspect categories.…”

Section: Implicit Aspect Extractionmentioning

confidence: 99%

Weakly Supervised Learning Approach for Implicit Aspect Extraction

Mar,

Shirai,

Kertkeidkachorn

2023

Information

View full text Add to dashboard Cite

Aspect-based sentiment analysis (ABSA) is a process to extract an aspect of a product from a customer review and identify its polarity. Most previous studies of ABSA focused on explicit aspects, but implicit aspects have not yet been the subject of much attention. This paper proposes a novel weakly supervised method for implicit aspect extraction, which is a task to classify a sentence into a pre-defined implicit aspect category. A dataset labeled with implicit aspects is automatically constructed from unlabeled sentences as follows. First, explicit sentences are obtained by extracting explicit aspects from unlabeled sentences, while sentences that do not contain explicit aspects are preserved as candidates of implicit sentences. Second, clustering is performed to merge the explicit and implicit sentences that share the same aspect. Third, the aspect of the explicit sentence is assigned to the implicit sentences in the same cluster as the implicit aspect label. Then, the BERT model is fine-tuned for implicit aspect extraction using the constructed dataset. The results of the experiments show that our method achieves 82% and 84% accuracy for mobile phone and PC reviews, respectively, which are 20 and 21 percentage points higher than the baseline.

show abstract

Process assessment of small scale low temperature methanol synthesis

Cited by 5 publications

References 3 publications

Hydrogenation of Carboxylic Acids, Esters, and Related Compounds over Heterogeneous Catalysts: A Step toward Sustainable and Carbon-Neutral Processes

Hydrogenation of Carboxylic Acids, Esters, and Related Compounds over Heterogeneous Catalysts: A Step toward Sustainable and Carbon-Neutral Processes

Theoretical and Experimental Approach to the Production of ZnO Nanoparticles by Controlled Precipitation Method in Methanol

Weakly Supervised Learning Approach for Implicit Aspect Extraction

Contact Info

Product

Resources

About