Hydrogen from Depleted/Depleting Hydrocarbon Reservoirs: A Reservoir Engineering Perspective
, Johannes Fabian Bauer 1, Oleksandr Burachok 2, Patrick Kowollik 2, Michael Olbricht 3 and Mohd Amro 1Round 1
Reviewer 1 Report
Comments and Suggestions for Authors
Alkan et al. have presented an overview on hydrogen from depleted/depleting dydrocarbon reservoirs. Basically, it is a comprehensive and important review that is deserved publication in this journal. Before acceptation, I suggest to make minor revisions listed below.
1. Please provide more eye-catching pictures and figures in the literature to catch the readers’ eyes.
2. Catalyst is a key factor for H2 production from DHRs. The authors should pay some attention to this and share your point views.
3. The conclusions should be strengthened. For example, your vision for future work in this field should be included.
As a review, the references are not enough, please cite more recent papers in this field.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for Authors
The submitted manuscript, "Hydrogen from Depleted/Depleting Hydrocarbon Reservoirs; A Reservoir Engineering Perspective," addresses a pertinent issue in the context of sustainable energy production and climate change mitigation strategies. The authors present a concise overview of technologies for H2 production from depleted and DHRs, focusing on methods that reduce or avoid CO2 emissions, which is a crucial aspect of aligning hydrogen production with global decarbonization goals. Overall, this manuscript offers a valuable contribution to the field by exploring innovative methods for hydrogen production from DHRs with a focus on environmental sustainability. With some enhancements, particularly in providing more detailed data, addressing technical challenges, and including comparative assessments. Hence, I would like to see this work published on the coming issue of the Applied Sciences after some minor revision, detailed below:
1. A more detailed quantitative analysis could strengthen the study. Providing specific numbers or ranges for H2 yields, CO2 storage capacity, and cost estimates would enhance the practical utility of the findings.
2. The text hints at technical challenges associated with each method but does not delve deeply into potential solutions or the technological advancements needed to overcome these hurdles. Elaborating on these aspects would make the study more comprehensive.
3. The manuscript would benefit from a more in-depth comparative analysis of the proposed methods against each other and against established hydrogen production technologies. This could include a table or graphical representation summarizing key parameters such as efficiency, cost, environmental impact, and scalability.
4. Including case studies or real-world examples, if available, would provide empirical evidence supporting the theoretical concepts discussed. This would increase the credibility and applicability of the proposed methodologies.
Comments on the Quality of English Language
On the whole, the English expression is fluent and meets the requirements of journal publication.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
